John moffet



PatentedAug. 30, 1887; I

(No Model.)

J. MOPFET.

PORTABLE DRILLING MAGHINE.

' N. PETERS. PholaLhhngnpher, Walhin nv Qwitweooaa UNITED STATES PATENT OFEIcE.

JOHN MOFFET, OF NEW YORK, N. Y.

PORTABLE DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 369,120, dated August 30, 1887.

Application filed December 2!, 1886. Serial No. 222,454. (No model.)

To all whom it may concern:

Be it known that I, JOHN MOFFET, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Portable Drilling-Machines; and I do hereby declare the following to be a full,

In the erection of nearly all metallic struct-' ures-such as vessels and bridges many of the holes intended for the reception of bolts and rivets must be bored after the parts to be connected are placed in position. This has commonly been accomplished by the use of a suitable clamping device applied to the parts in which the hole was to be bored, and boring the same by the means of the ordinary ratchetdrill manipulated by the hand of the artisan, which is a very slow and fatiguing process.

The object of my invention is, therefore, to furnish the workmen employed upon such metallic structures with a boring apparatus that shall be adapted to all the various positions in which it may be desired to bore holes in such structures, that may be readily detached from one place and applied in another, and that has for its motive power a rotary engine operated by steam or compressed air, said engine being attached to the same frame that carries the boring-spindle, and being removable from place to place with it; and the invention consists in the construction and combination of parts by which the engine is connected with the boring-shaft and by which it operates the same, as hereinafter fully set forth.

In the accompanying drawings, in which similar letters of reference relate to like parts in the different figures, Figure 1 is aperspecv tive view of the machine complete in position for work. Fig. 2 is a longitudinal section of the same, showing the method of connecting the engine with the boring-spindle and the devices employed for forcing the drillforward.

In the figures, A represents the portion of a structure in which it is desired to bore certain holes.

B is the clamping-frame by which the machine is held in the desired position with relation to that part of the structure to be operated upon.

C is the engine-cylinder, preferably constructed in accordance with the requirements of United States Patent No. 300,998, granted to me on the 24th day of June, 1884, although a rotary engine of somewhat different construction might be employed if it had the necessary requisites of being lightly constructed and of efficiency. This cylinderO is provided at diametrically-opposite points with the tubular connections a, receiving the pipe h, through which steam or compressed air 1s brought to the engine by means of a flexible pipe connecting with a steam-boiler or compressed-air receiver, as either one or the other is used to propel the engine. Tlus pipe I) also receives and supports the lubricator D, by means of which oil is supplied to keep the working parts of the engine within the cylin-- der properly lubricated. A pipe, Z), attached to the connection a, forms the exhaust through which the air or steam, after expending its energy upon the engine-piston, escapes.

Upon the under side of the cylinder 0 s a projection, E, preferably integral therewith. This projection forms a sleeve or long yournal-bearing, in which the boring-spindle F is carried. This spindle is provided at one end with a suitable socket to receive a drill or other boring-tool, d, and has firmly secured to its opposite end the gear-Wheel c, which engages with the pinions c, keyed upon the projecting end of the engineshaft 0. As the wheel cis much larger than the pinion upon the engineshaft, it follows that the revolutions of the latter willbe greatly in excess of those of the boringspindle, and that there will be a consequent increaseof power in the latter, with a corresponding decrease of speed, thus enabllng a very small swiftlyu'nnning engine to furnish all the power needed for operating the drill, without increasing the weight of the machine to such, an extent as to render it unwieldy.

Firmly secured to one end of the cylinder 0 is a frame, G, having an opening which re ceives the gear-wheel c, and an additional opening, in which the collar h upon the inner end of the feed-screw s is placed. This feeds'crew is thus attached and extends outwardly from the frame G, and is received into the sleeve-nut n, which is provided at its outer extremity with a pivoted joint, on, upon which it turns when revolved by the handles 0 or other suitable means. The point a has a bearing in the upright of the clamping-frame B and forms the point of resistance for the drill in its forward motion.

A cover, at, is attached to the frame G, surrounding the gears c and c, and forming asafeguard for the operator by preventing his clothing or fingers from being caught in said gears while manipulating the machine, and in order that the machine may be handled, if necessary, while in a heated condition, wooden handles d d are attached to the tubular connections a (1' upon each side. These handles, being near the center of gravity of the machine, furnish a ready and convenient means for its transportation to the different positions in which its services may be needed.

The operation is as follows: The clamp B having been attached to the structure in a suitable position, the machine is placed with the point of the drill resting upon the spotwhere it is desired to bore the hole, whilethe pointed end of the sleeve-nut is received in a depression formed in the upright of the clampframe. By turning the nut the drill is made to press forcibly upon the point at which it is desired to pierce the metal, and connection having been made between the engine and the steam-boiler or compressedair vessel by manipulating the stop-cock k and sleevenut n, the drilling is begun and the operator is able to control the speed and forward movement of the drill at will.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent, the following:

1. In a pcrtable boring-machine, the combination of the boring-spindle with a rotary engine, upon the cylinder of which is formed the journal-bearing for the boring-spindle, as set forth.

2. In a portable boring-machine, the combination of the boring-spindle, the rotary engine, with its cylinder, upon which is formed the journal-bearing for the boring-spindle,the gear connecting the boring-spindle and engine-shaft, and the fecd-screw and sleeve-nut adapted to turn and force forward the boringtool, as set forth.

3. In a portable boring-machine, the cylinder provided with diamctric tubular connections, as set forth, in combination with the handles attached to said connections, as and for the purpose specified.

4. In a portable machine for boring, the combination of the cylinder, the boring-spindle, the gear connecting said spindle with the engine-shaft, and the cover for said gears, arranged as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses. JOHN MOFFET.

Witnesses:

BERNARD FLANAGAN, JOHN DOYLE. 

